fitzgerald



2 Sheets-Sheet 1. J. FITZGERALD.

Flour Mill. No. 4,089. I Patented June 25, 1845.

N PETERS. Photo-Wham Wishinglcn. 0,1.

2 Sheets-Shee1 2. I 1.. FITZGERALD.

Flour Mill.

Patented June 25, 1845.

JESSE FITZGERALD, OF NEW YORK, N. Y.

MILL FOR GRINDING COFFEE, 85c.

Specification of Letters Patent No. 4,089, dated June 25, 1845.

To all whom it may concern Be it known that I, Jnssn FITZGERALD, of

the city, county, and State of New York, have invented a Mill forGrinding Various Materials; and I hereby declare that the following is afull and exact description.

The mill consists of a bur stone (monolith) cone, running in a femalecone made of bur I stone chips or small pieces, when intended forgrinding certain materials and, when for certain other articles, runningin a female cone formed of cast iron segments between which are setedges of steel or other metal.

To enable other to make and use my in vention I proceed to describe itsconstruction and operation, reference being had to three sheets ofdrawings hereunto annexed and making part of this specification.

Figure 1 perspective view of the mill as it is generally arranged, thatis fixed upon an upright post. Fig. 2 view of the top. Fig. 3 crosssection of the mill. Fig. 4: section showing the method of feeding. Fig.5 the segments and steel plates. Fig. 6 the same, with the plates setbetween the segments. Fig. 7 end of part of the female cylinder. Fig. 8section of the female cylinder when made of bur stone. Fig. 9 the coneof bur stone. Fig. 10 the larger end of the cones of bur stone.

The mill works on a horizontal axis. A band wheel is generally placedwhere a crank is seen in the drawing Fig. 1. It is for grinding allkinds of grain, coffee, spice, drugs, &c.

The cone is made of bur stone or a similar material. The novelty of themill consists chiefly in the female cones and the feeding apparatus.

The female cone of bur stone is thus made: An external cone is made ofcast iron and within this is laid the small pieces of bur stone, (aboutthe size of a walnut,) in cement. The waste chips of bur stone aregenerally used for this purpose. The stone is thus held on the principleof the arch and by the confinement of the cast iron case, firmly in itsplace and may thus be used until nearly worn. out with use.

The segment female cone is made of pieces of cast iron (13 Figs. 5 and3) laid together and held by hoops. The ends of the segments being alsoheld by their fitting into 7 the heads of the outer cone Between thesesegments are placed strips of steel plate (A Figs. 3 and 5) hinged atthe smaller inner diameter of the cone and extending outside of theouter cone. See Figs. 1 and 3. A hoop (N Fig. 2) ranged to be screwedup, by nuts on the rods, 0, Fig. 2. So that as fast as the steel platewears by the grinding process the hoop, N, is forced up by the screwsand thus sets in the steel plates. By this means also the mill can beset to grind the different materials required.

The hopper is peculiar. There is a large cavity at the bottom of it of acircular shape, see Fig. 1, P, through the center of which passes theshaft L. Upon the shaft and in this cavity is the gage, E, see Figs. 2,3, 4:, which is a circular disk, fitting into an opening in the head ofthe outer cone. This gage E, is set upon the end of a collar, D, whichis made to slide upon the shaft, L, and held in position by the setscrew, F. Thi collar, D, being movable the gage E is set as near to thecircular openinginto the mill as desirable and thus as much or as littlegrain admitted as desirable and this amount will be regular, the gagebeing continually revolving in the mass of the grain in the cavity ofthehopper and preventing a stagnation of it.

What I claim as my invention and desire to secure by Letters Patentis 1. Making the external cone in segments, having adjustable metallicteeth or grinders, A, between them, the said teeth being adjusted by themeans above described, or any other substantially the same.

2. The regulating the admission of the is argrain to the mill by meansof the revolving.

